PQ30RV21 SHARP [Sharp Electrionic Components], PQ30RV21 Datasheet - Page 7

• Manufacturer Part Number: PQ30RV21
• Description: Variable Output Low Power-Loss Voltage Regulators
• Manufacturer: SHARP [Sharp Electrionic Components]

Low Power-Loss Voltage Regulators
¡ON/OFF operation is available by mounting externally D
¡When V
¡V
regulator is turned off). When the output is OFF, V
maximum rating 7V.
In OFF-state, the load current flows to R
occurs at the load. OFF-state equivalent circuit R
In some case, as output voltage is getting lower (V
impossible to obtain the minimum value of V
the load.
V
O
An Example of ON/OFF Circuit Using the 1-chip Microcomputer Output Port (PQ30RV1)
ON/OFF Operation
IN
'=V
ADJ
<Specification>
Output port of microcomputer
Output should be set as follows.
From V
R
Assuming that V
V
If R
I
=1.6V X (10k +114.8k ) /10k
Hence, I
Next, assuming that V
I
Figure 1 shows the V
OH
OH
ADJ
2
ref
/R
X R
=1.6V X (R
=(5V-0.5V) (R
(max)=1.3V we get R
1
V
V
MAX. rating of I
15.6V R
1
=10k , we get R
is forcibly raised above V
C
=11.48
OH
OH
IN
L
O
/(R
1
OH
(max) =0.5 V
(min) =2.4 V (I
=1.25V (1+R
<0.2mA. Therefore V
L
+R
L
D
=52 (I
3
1
2
1
+R
)
F
V
(max)=0.8V for D
1
2
+R
ADJ
) /R
4
O
2
OH
-V
2
2
F
O
2
R
R
) /R
/R
=11.48 X R
(min) =0.5V for D
1
=0.3A)
=0.5mA
2
1
C
OH
X R
3
1
characteristics when R
=0
) we get V
=0.2mA)
1
X R
D
2
R
2
3
ref
2
OH
=0.49mA which is less than the rating.
L
(1.25V TYP) by applying the external signal, the output is turned off (pass transistor of
1
(min)is ensured.
from V
=114.8k
X 114.8k =0.17mA
2
O
+
C
=15.6V.
in case of V
O
O
V
'. So add the dummy resistance indicated by R
C
1
2
High : Output OFF
Low : Output ON
ADJ
in case of V
up to 10 is allowed. Select as high value of R
O
ADJ
R
through R
<1V) , impedance of load resistance rises. In such condition, it is sometime
and I
L
V
1
=10k , R
O
must be higher then V
2
OH
and R
OH
(min)=2.4V, we get V
as follows, ingnoring R
OH
2
. Therefore the value of R
3
(max), we get:
.
2
=115k , R
PQ30RV1/PQ30RV11/PQ30RV2/PQ30RV21
3
=0 , V
ref
MAX., and at the same time must be lower than
R
ADJ
1
Equivalent Circuit
in OFF-state
=V
L
IN
V
(52 ) :
=17V, R
ADJ
OH
2
R
(min)-V
must be as high as possible.
R
2
D
L
in the figure to the circuit parallel to
L
D
V
=52 , and D
L
2
O
’
and R
F
(max)=2.4V-0.8V=1.6V. From
R
D
2
as possible in this range.
1
=1S2076A (Hitachi).